72353977261 has 4 divisors (see below), whose sum is σ = 72357219900. Its totient is φ = 72350734624.

The previous prime is 72353977243. The next prime is 72353977271. The reversal of 72353977261 is 16277935327.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20020552036 + 52333425225 = 141494^2 + 228765^2 .

It is a cyclic number.

It is not a de Polignac number, because 72353977261 - 2¹³ = 72353969069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72353977199 and 72353977208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72353977211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1587616 + ... + 1632553.

It is an arithmetic number, because the mean of its divisors is an integer number (18089304975).

Almost surely, 2^72353977261 is an apocalyptic number.

It is an amenable number.

72353977261 is a deficient number, since it is larger than the sum of its proper divisors (3242639).

72353977261 is a wasteful number, since it uses less digits than its factorization.

72353977261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242638.

The product of its digits is 3333960, while the sum is 52.

The spelling of 72353977261 in words is "seventy-two billion, three hundred fifty-three million, nine hundred seventy-seven thousand, two hundred sixty-one".